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vovangra [49]
4 years ago
11

X

Mathematics
1 answer:
12345 [234]4 years ago
3 0

Answer: 28.35\ minutes

Step-by-step explanation:

Let be "x" the time in minutes a 150-pound person must walk at  4 mph to use at least 190 calories.

 The amount of calories that a 150-pound person uses  in 1 minute when walking at a speed of 4 mph is:

Calories\ per\ minute=6.7

Therefore, knowing this, we can write the following proportion:

\frac{1}{6.7}=\frac{x}{190}

Finally, we must solve for "x" in order to find its value.

Multiplying both sides of the equation by 190, we get this result:

(190)(\frac{1}{6.7})=(\frac{x}{190})(190)\\\\x=28.35

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3 years ago
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Answer:

For number 9)

Interval notation (-\infty,3]

For number 10)

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x \le 3

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Interval notation (-\infty,3]

On fractions you have to watch out for dividing by 0.

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4x=-2

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